Typical case of SPF extraction for simulated data, using a disk with PA = 270° and i = 70°. Left: disk image in polarized intensity, with an extraction zone defined by the green-shaded annulus. Right: polarized SPF normalized at 90° directly extracted from the disk surface (gray) and corrected from the limb brightening effect (black). The theoretical intrinsic SPF is plotted with a dashed purple line.